On Wed, Feb 2, 2011 at 7:59 AM, Karl Ove Hufthammer <[email protected]> wrote: > Dear list members, > > I recall seeing a convenience function for applying multiple functions to > one object (i.e., almost the opposite of 'mapply’) somewhere. > Example: If the function was named ’fun’ the output of > > fun(3.14, mode, typeof, class) > > would be identical to the output of > > c(mode(3.14), typeof(3.14), class(3.14)) > > Is my memory failing me, or does such a function already exists in a > package? Of course, it’s not difficult to define a summary function and > apply this to the object, but writing, for example, > > fun(x, mean, median, sd, mad) > > to quickly show the relevant information is much more *convient*. > > > It would be even nicer with a function that could also handle vectors and > lists of values, and output the result as data frames or matrices. Example: > > x = c("foo", "bar", "foobar") > fun(x, nchar, function(st) substr(st, 1 ,2) ) > > y = list(3, 3L, 3.14, factor(3)) > fun(x, mode, typeof, class) > > -- > Karl Ove Hufthammer > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. >
Karl, Perhaps you're thinking of the Reduce function? There's an example from the help page that you might be able to adapt to your purpose. ## Iterative function application: Funcall <- function(f, ...) f(...) ## Compute log(exp(acos(cos(0)) Reduce(Funcall, list(log, exp, acos, cos), 0, right = TRUE) HTH, James ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
